Toyota Camry (XV70): Open in Bus 1 Main Bus Line
DESCRIPTION
There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 23 (CA1H) and 8 (CA1L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.
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Symptom | Trouble Area |
|---|---|
|
Resistance between terminals 23 (CA1H) and 8 (CA1L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher. |
|
This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.
WIRING DIAGRAM
w/ Parking Assist Monitor System or Panoramic View Monitor System
w/ Rear View Monitor System
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
- Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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- Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
- After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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- After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
- After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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HINT:
- Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
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1. | CHECK VEHICLE TYPE |
(a) Check vehicle type.
|
Result | Proceed to |
|---|---|
|
w/ Parking Assist Monitor System or Panoramic View Monitor System |
A |
| w/ Rear View Monitor System |
B |
| B |
.gif) | GO TO STEP 6 |
|
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| 2. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A66 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*a | Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
|
*c | to No. 5 CAN Junction Connector |
- | - |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
A66-3 (CANH) - A66-9 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | Central gateway ECU (network gateway ECU) |
|
A66-5 (CANH) - A66-11 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | No. 5 CAN junction connector |
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
| NG (Line to No. 5 CAN junction connector) |
C |
| A |
| REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C |
| GO TO STEP 4 |
|
| 3. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) |
(a) Reconnect the A66 No. 1 CAN junction connector.
(b) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) |
| 4. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 5 CAN JUNCTION CONNECTOR) |
(a) Reconnect the A66 No. 1 CAN junction connector.
(b) Disconnect the R98 No. 5 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*a | Front view of wire harness connector (to No. 5 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
|
*c | to No. 1 CAN Junction Connector |
- | - |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition | Connected to |
|---|---|---|---|
|
R98-1 (CANH) - R98-11 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | Central gateway ECU (network gateway ECU) |
|
R98-5 (CANH) - R98-15 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω | No. 1 CAN junction connector |
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (Line to No. 1 CAN junction connector) |
B |
| NG (Line to central gateway ECU (network gateway ECU)) |
C |
| A |
| REPLACE NO. 5 CAN JUNCTION CONNECTOR |
| B |
| REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) |
|
| 5. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 5 CAN JUNCTION CONNECTOR) |
(a) Reconnect the R98 No. 5 CAN junction connector.
(b) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 5 CAN JUNCTION CONNECTOR) |
| 6. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A66 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*a | Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A66-3 (CANH) - A66-9 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
|
A66-5 (CANH) - A66-11 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
| OK | | REPLACE NO. 1 CAN JUNCTION CONNECTOR |
|
| 7. |
CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) |
(a) Reconnect the A66 No. 1 CAN junction connector.
(b) Disconnect the K76 central gateway ECU (network gateway ECU) connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
|
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) |
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Components
COMPONENTS ILLUSTRATION
*1 FUEL PUMP ASSEMBLY
*2 FUEL PUMP PROTECTOR
*3 NO. 1 FUEL PIPE SUB-ASSEMBLY
*4 NO. 2 FUEL TUBE SUB-ASSEMBLY
*5 FUEL PUMP LIFTER ASSEMBLY
*6 FUEL PUMP LIFTER GUIDE
*7 FUEL PUMP SPACER GASKET
*8 FUEL TUB
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